Improvement in boiler-tube scrapers



JOHN COLLICOTT.

Improvement in Boiler Tube Scraper.

Pafemd March 12, 1872'.

[iz MVM/f ma?" y Wim/65563 md //f co. M x /nsaon/ML: fnarfss/ maaar JOHNOOLLIOOTT, OF "WEST ROXBU'RY, MASSACHUSETTS.

IMPROVEMENT EN BOILER=TUBE SCRAPERS.

Specification forming part of Letters Patent No. 124,421, dated March12, 1672.

To all whom it may concern:

Be it knon that I, J onN CoLLroor'r, of West Roxbury, in the county ofNorfolk and State of Massachusetts, have invented an Improvement inconnection with Boiler-Tube Scrapers 5 of which the following, whentaken in connection with the accompanying drawing, is a full and exactspeciiication:

My invention relates to a tube-scraper or flue-cleaner, and consistsmainly in causing the arms to be spread by means of spiral springs setover 0r upon spurs, the said arms being provided with stops, as fullydescribed below.

In the accompanying drawing, Figure l is a view of a boiler-tube scraperembodying my invention. Fig. 2 is a section oi' the same, showing thepositions of the springs and spurs. Fig. 3 is a section of one of thearms.

a a are the arms. b b are spiral springs, setting over and held in placeby the spurs c c c c. d is a stop or ledge.

In practical operation, as the scraper, eX- pandedby means of the spursc c, enters the tube, it contracts to the size of the inside oi thetube, scraping against all portions thereof, and removing entirely alldeposit. The ledge d prevents the arm from expanding too much, and thespurs c c c c prevent the springs from dropping out. The scraper isinserted by means oi' alongrod, as usual. Of course, scrapers of dierentsizes are manufactured to fit tubes of different or smaller diameters.

The accompanying drawing corresponds in size to some of the Scrapers inuse.

I do not claim anything new in the scraping-edge, the heads, ribs, orrod; neither do I claim anything covered by patents numbered 66,387 and89,941.

Having thus fully described my invention, what I claim, and desire tosecure by Letters Patent, is-

Tlie combination and arrangement of the stop or ledge d and arms a withthe spiral springs b b and spurs c c c c, the whole being Combined,arranged, and constructed for the purposes above described, andsubstantially in the manner hereinbefore specified.

JOHN GOLLIGOT'I.

Witnesses HENRY W. WiLLiAi/rs, B. W. WILLIAMs.

